In an attempt to halt the North Korean offensive, General
MacArthur ordered an amphibious invasion at Inchon, far behind enemy lines.
U.S. forces landed at three separate places on the morning of September
15, taking the North Koreans entirely by surprise. Before the end of the
day all resistance at Inchon had been overcome, with minimal U.S. casualties.

In the days after Inchon the entire course of the Korean War changed.
Now it was the North Koreans who were in retreat, so that by the end
of the month Seoul was in United Nations hands. Of the 90,000 North Korean
soldiers who had been involved in the invasion, over half had been killed,
wounded, or taken prisoner, and the remnants of the North Korean army
limped back behind the 38th parallel.